What is SHOT CLOCK (billiard)?
SHOT CLOCK (billiard) meaning Any timing device used to gauge the time limit in which a player is allowed to play a shot. The timing device must have at least the functions of a stop watch: reset to zero, start, and stop. A simple wrist watch without timing functions is not sufficient.
reference: Billiard Congress of America Official Rules and Records Book: Glossary of Billiard TermsWhat is